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If the hdd pcb is damaged or burnt, need to replace it with the
same model of pcb to make the hdd work.
1. For WD hdd, need to check the number on the pcb and the main
chip.

The number of pcb is 2060-701292-000 REV A

The number of pcb is 2060-701335-003 REV B

The number of main chip is 88i6540-LFH

The number of main chip is 88i6545-TFJ1

For WD hdd, the ROM chip stores the firmware of the hdd
(firmware for hdd is like operating system for computer),
you need to change the ROM chip from
original board to the replacement board, in order to make the
replacement board compatible with your HDD.

For some new models of WD pcb, it has no independent ROM chip,
the firmware is inside the main chip, need some tools to read it
from the original pcb and write to the
replacement board,
or swap the main chip.
2. For Maxtor hdd, need to check the number of main chip.

The number of main chip is 040111300

The number of main chip is 040125400
The Maxtor hdd no need to replace the RAM chip.
3. For Seagate hdd, need to check the number of pcb and main
chip.

The number of pcb is 100466725 REV A

The number of pcb is 100422559 REV B

The number of main chip is 0750T 6727517

The number of main chip is 100367028

For Seagate hdd, also need to replace the ROM chip on pcb.
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